| n | mean | sd | min | max | |
|---|---|---|---|---|---|
| Trait self-control | 162 | 2.83 | 0.52 | 1.85 | 4.31 |
| Concentration (CIS) | 162 | 3.93 | 1.12 | 1.60 | 6.80 |
| Disturbances in sleep quality (PSQI) | 149 | 5.91 | 2.43 | 1.00 | 15.00 |
| Chronotype (MCTQ) | 140 | 5.11 | 1.08 | 2.44 | 8.08 |
| Alcohol usage (AUDIT) | 149 | 8.89 | 5.23 | 0.00 | 25.00 |
The left shows a histogram of the …
The top right figure shows the correlation between the different variables in the database. From the heatmap, can be seen that there is a strong negative correlation between the disturbances in sleep quality (PSQI) and concentration (CIS) score. And a negative relation between the alcohol usage (AUDIT) of the participants and the trait self-control score. A positive correlation can be found between the chronotype (MCTQ) and both the disturbances in sleep quality and alcohol usage (AUDIT).